Detectives said they found a sawed-off rifle used in all three attacks in a duffel bag in a closet at the home of Perrone’s girlfriend. They also found .22-caliber ammunition, black gloves, women’s clothing, a bloody knife and a bottle of bleach, police said.

Perrone’s fingerprint was lifted from the murder weapon, Police Commissioner Ray Kelly said. Kelly said it was ‘reasonable to assume’ Perrone would have killed again.

Sitting inside the courtroom were family members of the three Brooklyn shop owners Perrone is accused of killing.

In the middle of the 10-minute arraignment, Perrone turned and stared down their relatives, Brown reported.